SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df647b0c34384308524fac03e92972a46d20d51368560fd647707cf94d76864' 
  AND token = 'PgTkzwJRYjRgWpC0uNVPsyFsC15/lws/Y6lYQ57PuXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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