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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89967f10dcce189b163c37cf536e928347f88a30ba7305cae77954f7b0d9de86' 
  AND token = 'QfNrQoP012+Gr04Zojem8Wo8AB6hrZM3cqEFXWqqVoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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