SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f165f9909685561a6d5ef847257de85b62b639630b0d60a8abf28b68431478c' 
  AND token = 'wDZDORWW5C6Qj3RgYnagy2q5q+yKAMNRmLGfwMUbUFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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