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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873042e99ba51df2b31dce973ae2fed7f4b6e8d85a8da210e136f486a91a8aea' 
  AND token = 'tWd6nsIGFbMf1CBhMcn8aUk5tIRn0GESN4TUBT+ROfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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