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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a43e0fe6a60c9f26be46046bed531b4f438fcaef8fa6fcfeb0dea475b0c595' 
  AND token = '1MgFJmKpqy2G7DhgVSbHnnQ9tHsF4Z+DtM7kwV0k3EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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