ManaPHP\Cache\Adapter\Db::exists PHP Метод

    public function exists($key)
    {
        /**
         * @var \ManaPHP\Cache\Adapter\Db\Model $model
         */
        $model = new $this->_model();
        $model = $model::findFirst(['hash' => md5($key)]);
        return $model !== false && $model->expired_time >= time();
    }