SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321bc10affb0aac51e028547cdef9a0e8b377e6b343e28fd7931a0803bd591e5' 
  AND token = '/pJapcSd7mr7Co/x/2YYeAObLxoFN8jBv0nww++WqAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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