SELECT 
  * 
FROM 
  cscart_bm_containers as c 
  LEFT JOIN cscart_bm_grids as g ON g.container_id = c.container_id 
WHERE 
  1 
  AND g.container_id IN (6301, 6302, 6315, 6304) 
ORDER BY 
  g.order, 
  g.parent_id, 
  g.grid_id ASC

Query time 0.00518

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "24.41"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "16.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "c",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "container_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 4,
            "rows_produced_per_join": 4,
            "filtered": "100.00",
            "index_condition": "(`s2cart`.`c`.`container_id` in (6301,6302,6315,6304))",
            "cost_info": {
              "read_cost": "2.41",
              "eval_cost": "0.40",
              "prefix_cost": "2.81",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "container_id",
              "location_id",
              "position",
              "width",
              "user_class",
              "linked_to_default",
              "status",
              "company_id"
            ]
          }
        },
        {
          "table": {
            "table_name": "g",
            "access_type": "ref",
            "possible_keys": [
              "container_id"
            ],
            "key": "container_id",
            "used_key_parts": [
              "container_id"
            ],
            "key_length": "3",
            "ref": [
              "s2cart.c.container_id"
            ],
            "rows_examined_per_scan": 4,
            "rows_produced_per_join": 16,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "4.00",
              "eval_cost": "1.60",
              "prefix_cost": "8.41",
              "data_read_per_join": "26K"
            },
            "used_columns": [
              "grid_id",
              "container_id",
              "parent_id",
              "order",
              "width",
              "offset",
              "user_class",
              "omega",
              "alpha",
              "wrapper",
              "content_align",
              "html_element",
              "clear",
              "status",
              "section_class",
              "section_width",
              "abt__ut2_extended",
              "abt__ut2_padding",
              "is_tabbed",
              "abt__ut2_use_lazy_load",
              "abt__ut2_show_blocks_in_tabs"
            ]
          }
        }
      ]
    }
  }
}