Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b2d7b6134463b4e01e6809c27e838127ddd8071f342dcd345da2fd5608f38c' 
  AND token = 'im61JkcLS68LvYL7AR4lVnsjTCxh5YjDjsUeVjcIREo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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