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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bd1eeb03f8108d3cf006965fdff86dbf123bcb80da6bcbdc9548268f20bcda' 
  AND token = 'dwncabDwRkIFxC7pchGpqYI9I0wrmSKVHtAxjPq1V4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}