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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1b13811acc40c139d11ee9d91bff65f5c61b15e3ee2e9242124451c6c157a9' 
  AND token = 'oSLl4Dch9WC9GibiMvAVljux78DcKeEpG4QTYWbV318=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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