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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2dc5222209803cdcbb972a2b1f486ea3dc1af203f6f5093f4c4fead6838b6d' 
  AND token = '+XmweM2DLC7ObyvMcSjcCjukt2Q9R8G7LFJmfvzPZy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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