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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43016c472b2f1725cd9f1dbe7bbd65cdfea5119d8f8d442b64e43050069a9832' 
  AND token = 'us+dgqQp3RmJv9ydT+uErkhra60MicsHeyj7l7BC+vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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