local function lock_and_find (key, lock_id, lock_timeout)
    if is_locked_by_another_owner(key, lock_id) then
        return { "locked_by_other" }
    end

    local existing_entry = get_existing_entry(key)
    if not existing_entry then
        return { "not_found" }
    end

    local additional_keys = existing_entry.additional_lock_keys
    if is_any_locked_by_another_owner(additional_keys) then
        return { "locked_by_other" }
    end

    acquire_lock(key, lock_id, lock_timeout)
    acquire_locks(additional_keys, lock_id, lock_timeout)

    update_expire_at(key, existing_entry)

    return { "ok", existing_entry.value }
end

return scriptResult(lock_and_find(KEYS[1], ARGV[3], ARGV[4]))