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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac71520c8e622dbd4cc6fa263b278821ea851ff3b01098405217f4b9461045f8' 
  AND token = 'MRO9kFrYrnvHoVdtts+botpCg1dVclw8hBbcHyDcmIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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