Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343ba972620b150b3a2b22cbc1514938f7b35e913a38391ad6007f2f5f766ea0' 
  AND token = '5vsS0ZmvgT45uuNhrlbsNzTuFzDbfFO7JWvLep295BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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