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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67bbeb33fa112fe52e73aaefdad94da6773b0eec88a63154c3af3bf72ea50cb' 
  AND token = 'zhbn9jVI06bNtq+uz6rgysTZhMNOUu8iYYFrNqSdQnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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