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mysql> create table auto_inc (a int,b int,c int auto_increment,d int,key auto(c),primary key p(a,d)) shardkey=d;
Query OK, 0 rows affected (0.12 sec)

mysql>  insert into shard.auto_inc ( a,b,d,c) values(1,2,3,0),(1,2,4,0);
Query OK, 2 rows affected (0.05 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql> select * from shard.auto_inc;
+---+------+---+---+
| a | b    | c | d |
+---+------+---+---+
| 1 |    2 | 2 | 4 |
| 1 |    2 | 1 | 3 |
+---+------+---+---+
2 rows in set (0.03 sec)

mysql> insert into shard.auto_inc ( a,b,d,c) values(11,12,13,0),(21,22,23,0);
Query OK, 2 rows affected (0.03 sec)
mysql> select * from shard.auto_inc;
+‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐+
| a | b | c | d |
+‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐+
| 21 | 22 | 2002 | 23 |
| 1 | 2 | 2 | 4 |
| 1 | 2 | 1 | 3 |
| 11 | 12 | 2001 | 13 |
+‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐+
4 rows in set (0.01 sec)

alter table auto_inc auto_increment=100

mysql> insert into auto_inc ( a,b,d,c) values(1,2,3,0),(1,2,4,0);
Query OK, 2 rows affected (0.73 sec)

mysql> select * from auto_inc;
+---+------+------+---+
| a | b    | c    | d |
+---+------+------+---+
| 1 |    2 | 4001 | 3 |
| 1 |    2 | 4002 | 4 |
+---+------+------+---+
2 rows in set (0.00 sec)

mysql> select last_insert_id();
+------------------+
| last_insert_id() |
+------------------+
| 4001             |
+------------------+
1 row in set (0.00 sec)