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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d1106dc40f9345ba3acb2b78db58edd31265cb63223cb367aa94b5b41929a5' 
  AND token = 'T9vkJw6iNXrGj70JgQM5zPkF22U0D8XD4bMAf192JsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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