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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c2dbd24c54b393fd7f07c5a1522b176a835cdbdf111a0952beeab43ecaa1c0' 
  AND token = '+KzjbS86k6jeurLq8UBuygApc1Q6amxV/Xl9QEaT6M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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