SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a442269f7669cd8c08b90d7d9d4a8c866856865d9f83369a1b21c8fa30c80e' 
  AND token = 'VQA9AjBnzVyrTO2CH/z6LBdqtYAojQLfT7NKOuxmGwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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