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add_action('wp_ajax_wpcf7_rescanned_form', 'wpcf7_rescanned_form');
add_action('wp_ajax_nopriv_wpcf7_rescanned_form', 'wpcf7_rescanned_form');

function wpcf7_rescanned_form() {
  update_option( 'my_option', 'my_value' );
}

add_filter( 'wpcf7_before_send_mail', 'fl_wpcf7_before_send_mail_function' ); 
function fl_wpcf7_before_send_mail_function( $contact_form ) {
  $my_value = get_option( 'my_option' );
}