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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a164b93d0f1bfe87606a8888f368d304999eb5c160eabd29d041d34e4f53992' 
  AND token = 'YS/5xQktSWcWenTWipCTwf1Q+S/5MO119vGnYbKtRvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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