SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10827b9e178ab4e9d16a5d3b57dfcfee29eb29f35f31287a706fb6f3bea38b4' 
  AND token = 'qz8U8r+Pc4KK1pqFwEhSid4FrD8RLAgUqTd2OhZDYSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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