SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94362e3e5c32d1266aa2f8b3fdc63235afd81448132803449801c2457d89826f' 
  AND token = 'MqLB8OwOhVpZWPYJGW5OAjqUVA8t07A9tmmbsb/VVgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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