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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98665a413ef5dcd77a8a9bfc18f8fd0d3af4287c504840fbe68ff896ec9aadb' 
  AND token = 'iGu5ayfnnZblp2hlckX/xsMDlI+oW2StqG/XJxOMdDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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