SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b85a0d8a183f8b2fca9dffc3146dba9b6431c4a2f78016b7459172292e78746' 
  AND token = '9zOAR6leuVMPBCHQgUMCBNgaCRVN+mvhFkJefyxth7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}