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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86759d6232953e1f318bd171f9caadcf2bc1d113116381d0bac396ae3d48d8c7' 
  AND token = 'fXpjO7LzZ+ZbaEO/ObbHBL7lQNAZQoyTVvwNUw5tZTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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