SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169aa9b87b29a8794ff035b91daf3246a59be6feb9c716b9db2106649fb12089' 
  AND token = 'fKuSWif61ZXkmDzWcZhKJ2yvjmxHth+7TpcoVn43YwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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