EXPLAINSELECT bmbm_code AS bmCode bmbank AS bankId bmcontract_code AS contractCode cierp_contract_code AS erpContractCode bmpay_style AS payStyle ciearn_money AS earnMoney cibegin_time AS beginTime ci

Without knowing the size and complexity of the database, it is difficult to determine what specific indexes would be most beneficial for this query. However, some general recommendations for optimizing the query performance could be:

1. Add an index on the back_money_info table for the STATUS column.
2. Add an index on the back_money_info table for the contract_code column.
3. Add an index on the back_money_info table for the business column.
4. Add an index on the contract_info table for the contract_code column.
5. Add an index on the back_money_bank table for the rec_id column.
6. Add an index on the erp_dict_info table for the CODE column.
7. Add an index on the erp_cust_company table for the company_code column and the back_use_flag column.