Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd682b19333acd7ad623d8b89ed9dfb9bf5d48de6c29052b1cc583e6c5f660ff6' 
  AND token = 'gmZRAehxF94SwXSeM5ZAAIUXo/PxvZ/UZGTNFxxynZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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