SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a8a6adff19372d8e0b8dfc15e92b1812b56db4427f94b0713231c58a72512e' 
  AND token = '4wY/6GI/K2Q8ihHuOubuRlpuqZCThfgGv80Rc5Naa6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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