| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
|---|---|---|---|---|---|---|---|---|---|
| 1 | SIMPLE | documents | const | PRIMARY | PRIMARY | 4 | const | 1 | |
| 1 | SIMPLE | documents_link | const | PRIMARY | PRIMARY | 4 | const | 1 | |
| 1 | SIMPLE | tree_locks | const | PRIMARY, type | PRIMARY | 5 | const, const | 0 | Unique row not found |