Apache Session locks in mysql slow query log

Hey folks,

Running rt-4.2.2, mysql 5.6.20 x64, centos 6 current my mysql slow_query
log shows many queries of the form:

Time: 140818 9:40:45

User@Host: rt_user[rt_user] @ localhost [] Id: 25407

Query_time: 2.002034 Lock_time: 0.000000 Rows_sent: 1 Rows_examined: 0

SET timestamp=1408369255;
SELECT GET_LOCK(‘Apache-Session-0761de9e80f5596ac2a5201158f795a8’, 3600);

Sessions are handled by Apache File Session:

Set($WebSessionClass, “Apache::Session::File”);

Two seconds seems like an long time for this, what am I missing?