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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084b7f50a954b8383690011905a139e499eb11d4c22b88eb7185c4bb680df692' 
  AND token = '9OD3u4X3yg5y14UE7j8gS2hQV3guvJxJCuhpwfBmNr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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