Block(reservation) of an auto increment line in mysql

Question

I developed a data importer CSV to my base mysql. The Resource is working correctly, but I believe there must be a better way to implement the following logic.

In the archive CSV depending or may not occur that 2 Inserts(master-detail) and the only way I have at the time of controlling them is through your PK self-improvement.

What I do - I perform an Insert, if there is such detail information, I retrieve the last insert (select max(id) table, or with the function LAST_INSERT_ID() and saved in my tbl of detail the information recovered.

Since my service is online, and other people can perform the same import procedure, it may be that the Insert on the same team and my operation is no longer reliable.

One way I thought, and I’m researching it is, like the mysql already know what the next index, I somehow reserve and block this index and do my procedure, in case something occurs it proceeds with the next line.

Someone has worked with this problem?