SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b81bdc638177c59c45991affd8fdf08a04968e07516c3fcf2adb84c8745bf50' 
  AND token = 'p4DtIChYJLBogZ8H4LmcpZgCpjGsu1ryjSY85pfjliQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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