How to get session key for Redis in YII2?

Question

Yii

I've been trying to get the correct session key for an hour, tell me where I'm missing something?
There is a config:

'session' => [
            'class' => 'yii\redis\Session',
            'redis' => 'redis',
            'keyPrefix' => 'QAINAR_SESS_',
            'timeout' => 3600,
        ],

echo "<pre>";
echo Yii::$app->session->id . PHP_EOL;
print_r(Yii::$app->session->keyPrefix . md5(json_encode([__CLASS__, Yii::$app->session->id])));
echo  PHP_EOL;
print_r(Yii::$app->redis->executeCommand('KEYS QAINAR_SESS_*'));
echo "</pre>";

I get the following:

8878353c8ca97c34021d62279cc7959a
QAINAR_SESS_85584472a3d4ad2bec0984e356079817
Array
(
    [0] => QAINAR_SESS_fd4011b394ac47f32666d77e2ecd7e6d
    [1] => QAINAR_SESS_e8192112a517f5f3b0e0e56def0aa2ce
)

As you can see, there is no QAINAR_SESS_85584472a3d4ad2bec0984e356079817 key in REDIS...
Code

Yii::$app->session->keyPrefix . md5(json_encode([__CLASS__, Yii::$app->session->id]))

taken from official code
https://github.com/yiisoft/yii2-redis/blob/master/...

/**
     * Generates a unique key used for storing session data in cache.
     * @param string $id session variable name
     * @return string a safe cache key associated with the session variable name
     */
    protected function calculateKey($id)
    {
        return $this->keyPrefix . md5(json_encode([__CLASS__, $id]));
    }

How to get redis key from session_id() - 8878353c8ca97c34021d62279cc7959a - QAINAR_SESS_fd4011b394ac47f32666d77e2ecd7e6d ?