Run second execute command if first execute command is successful

I am trying to make my code not loop the whole entire thing over and over, I am trying to make it stop and loop only the first execute if nothing happens there. The function at execute command 1 is it reads data from a card and stores it into the db. This is the current if statement I am trying to use with the code:

import serial
from datetime import datetime, timedelta
ser = serial.Serial('COM4',9600)

print("Serial input ready..")
import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="rfid",
  passwd="rfidpasswd",
  database="rfid"
)
mycursor = mydb.cursor()    
try:
  while True:
    line = ser.readline().strip()
    l= line
    data = line.decode('ascii').split(':')
    rid = data[0]
    tag = data[1]
    t = datetime.now() -timedelta(minutes = 190 )

    command2 = "INSERT INTO tag_logs (reader_id, tag_no) VALUES ('" +rid+ "','" +tag+ "')"
    mycursor.execute(command2)
    mydb.commit() 

    c1 = "Select * From tag_logs where reader_id = 'Reader_001' and timestamp > '" + str(t) +"' and tag_no = '"+tag+"'"

    print(c1)

    n=mycursor.execute(c1)


    result1 = mycursor.fetchall()
    print((n))
    print (len(result1))
    x= (len(result1))

    mycursor = mydb.cursor(buffered=True)

    if x > 0:   
       ser.write(b'H')
       print('done')


    else:

      ser.write(b'L')
      print('deny')

    if l == 1:
      n=mycursor.execute(c1)

    else:
      mycursor.execute(command1)


except KeyboardInterrupt:
  pass