How to get Laravel Session redis key

For example:

redis key : laravel_cache:SvOitF7nejIyffTlGu4mPgMcfN1hUBZiWfL9L0eK
string:
a:3:{s:6:"_token";s:40:"IunUzp2uDqqj32bfX4OjYq5hyFLcJPowpUGdCOgA";s:9:"_previous";a:1:{s:3:"url";s:21:"http://test.com";}s:6:"_flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}}

How do external programs get "SvOitF7nejIyffTlGu4mPgMcfN1hUBZiWfL9L0eK" to find this