SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9646eb3224684cce28909adfea0789e7084717b7c87497c95a12dae570c48361' 
  AND token = 'vMVcUGspqRZo+FvXSe/FjiKFlhMWEF0ZxxtWgGsycro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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