How long should my cookie token be?

This is what i've come up with to store a cookie to validate a user on my site.

How long should the token be that I generate? Is 33 enough or should it be 64? and is my generation secure enough?

<?PHP 
$token = bin2hex(openssl_random_pseudo_bytes(33));
echo $token.'<br>';
$hash = hash('sha256', $token);
echo $hash;

//Test user db and local cookie
    $stored_hash = '5be39777ad41916c5fa1e78681bfc8793a5cfe7c27842846ad23396e44b390a7';
    $cookie = '1a9243f95354252d937d2b99e64a7eeb462e00c72b26d488426f08ef11667522c6';

$cookie_hash = hash('sha256', $cookie);

if(hash_equals($stored_hash, $cookie_hash))
  echo 'true';
else
  echo 'false';
?>