Electronic – ESP8266 detect LED flash with photoresistor Schmitt trigger

I made some experiments with ESP8266 to detect when an external LED is on or off (I need to log this activity).
This is the test-circuit I used till now:

^{simulate this circuit – Schematic created using CircuitLab}

I have a lot of programming experience, but every time I need to deal with the electronics circuits I have some difficulties, so the above schematic may be wrong.
All resistor values are empirically calculated. I used a wave generator (5Hz) to simulate LED flashes, and on the oscilloscope I get:

• LED on: ~3.22V on (-) OAMP pin
• LED off: ~1V on (-) OAMP pin
• On (+) OAMP pin I set ~2V

Now I would ask:

1. How can I improve this schematic?
2. How to reduce power consumption?
3. Does exist a better OAMP (instead of LM358) specifically designed for low power circuits?

Here there're some glabal tech spec:

• VDD: 3.3V
• Max led frequency: 2Hz
• low power consumption
• I need to measure the time interval between two pulses to detect system (which LED belongs to) state. For example: 1sec between two pulses mean state A, 0.2sec between two pulses mean state B, etc..

NOTE: in the final circuit I cannot interfere with LED and its circuit, I can only watch its light.