SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7694f28997bf57eb39167ce892268bb54a55d19974aecec63e31842025e45b' 
  AND token = '1bNPL5jtqdJX/eusA9o2r+IhbUIyYTLDJWqGRV3Vq8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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