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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc216157fa0fe298b6c053ec98f5bb67d9751668ed73c720d33deedb7972c85b' 
  AND token = 'j89f/NNq/g15XDi89qxi1cA73n7dwpjXqtOULBVUplc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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