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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0df59e2f1c31f77017783ee534ed9e641080f2f7b12c2d094e0be129cff2fe' 
  AND token = 'VBKjQi620NCFb3uibE2IPIKja3fakdI0OAJ+H8o8BHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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