SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2cbbb38380a37fd67145906cd1708babf5283588e06150ba5a677874072ac6' 
  AND token = 'IyCPCJxXlqLvC9ZuplBRgpGBjsqpaBE3rT+TJaj6A/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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