Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c623d8562e39e8df334853a99cf5121f84acf29a804fc18fe7323479c7311226' 
  AND token = 'lA5RqivYXrDIzPpneXdnpI1pX//v8kQrjnzmP2oBcm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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