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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed67a680f7132b6b8774ec150998a172d124c33f55c9a50f81e201a8790242ad' 
  AND token = '1VLUtyPsD1mYx3WY0EW0n6r1n8S45ToqR9uq8JhrzD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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