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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f477d807a7ea000f3fea5c0d8e3b3da4df87ae2b263be78282cc925f6930a5' 
  AND token = 'XsxtZkk9DS3Ct3spOZXLKb56EB08UtwUB8b59X9d7r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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