Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b6873bba39bf816044f332c808922a44423e73907aef9cd30b74607519f0d0' 
  AND token = 'G3O6IL9QDNyGzwByvW/j+mDnEoXdidz8UJa72bWF1fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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