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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f1ef27a02f811ae914ed875c08a1f43efa6261fdd75e8b6913b581c2028e9a' 
  AND token = '5NW9QvHU8O3VMbTd4f5atchiWdglfVEvn9GKNU8g3wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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