Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe3e5a3cb8750e801ad9c6d48b06b2347960dc8e4bc7cfb83184e47a33a0a7c' 
  AND token = '7eNsE2Q4xIzFwuJl2e44eFUWzsRPgn6MAKrUfPx59Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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