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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439a194e8794b51317be9965a11e5eafcec610831a8bcdbc0f1d97283173c165' 
  AND token = 'bE6Yw5UaUMfDst613GnRyCO45mcvQ8Ty67SfD0yGDGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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