Plans are different.
{
"FieldQuery": "select c_first, c_middle, c_last, c_street_1, c_street_2, c_city, c_state, c_zip, c_phone, c_credit, c_credit_lim, c_discount, c_balance, c_ytd_payment, c_since from customer1 where 1 != 1",
"Keyspace": {
"Name": "main",
"Sharded": true
},
"OperatorType": "Route",
"Query": "select c_first, c_middle, c_last, c_street_1, c_street_2, c_city, c_state, c_zip, c_phone, c_credit, c_credit_lim, c_discount, c_balance, c_ytd_payment, c_since from customer1 where c_w_id = :c_w_id and c_d_id = :c_w_id and c_id = :c_w_id for update",
"Table": "customer1",
"Values": [
":c_w_id"
],
"Variant": "EqualUnique",
"Vindex": "hash"
}