SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092559220966cf579d235218bf2a283adcb4acd8932e3c341b46755111b6446e' 
  AND token = '10Uzpw/Bs4Kd2+0hEzkMxT/oPPuJVx5BzNjDyTjMZpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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