Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3afe5ce18d87f9f985ade8feadc28d04827ae9576159866acf2f43a7f2c5ae' 
  AND token = '3EhfkYLF+fb+9JuyIQpUE2KGNZY0kLb1XdXqdwfKo1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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