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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd874290c6381124c4209a492770f8fcdcb176dc8c8c0152557b64867cc69e046' 
  AND token = '8lDG5pXlBitoJazVjqb72bxWLyu01zw971I6heJ3IYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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