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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bfb23de7e7d55c55470199e403eb33ee6fd5aab06c4fa1febcb0c0a1e19693' 
  AND token = 'hf0ghSpH0WDChtOHLlFyzAd4U7aaZT7IkcTcJj3fOGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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