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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa27e69364f7e8dade7ef499e653f273bdc7c95f1f211ca72e967f4384f070c' 
  AND token = '62YGg0i5x7FoqX9MSm8jNlTgwFf/ehEpozaghrVRVzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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