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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd47534c80070da2ca503ff71a48f33f97101e2ac558012ff02631f722e37bd7' 
  AND token = 'Evl6OLoibVkmvgTbkMkb1jCd/Z5GUhRQd/tSXoRfFvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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