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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12e7f0dbd5b18e86e59bb95dd6a36cc0446d5cc892839f17efc4497f3b4b9ec' 
  AND token = 'W1gw6P/83IgJay6xRIw1/8+wAg5TNRBQ376SdSO9AnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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