{
"query_block": {
"select_id": 1,
"nested_loop": [
{
"table": {
"table_name": "cscart_categories",
"access_type": "ref",
"possible_keys": ["parent"],
"key": "parent",
"key_length": "3",
"used_key_parts": ["parent_id"],
"ref": ["const"],
"rows": 1,
"filtered": 100
}
}
]
}
}