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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd784ca2b038ceb5f25a60997cc1b9f5aae10e87451fec6238807d9bd2eb0d903' 
  AND token = 'zS1sOWv2twlBdIGy1jk/dmsWxsymkRw/tglJYzdSPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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