SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb692163b6e12ca502bb3fa0326af2827dac6cd64d3257508da038fc0fe3098' 
  AND token = 'WmfvEHAKw3zABM9V4ZfW1+lg929crT5HhqAh6DJBYGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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