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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcfe55d03ce1b2c49c71cd81f7ff634e04aed2e3e192c7e6ee26c9020a59184' 
  AND token = '71PZQ3vmGo8TEzvupVuVShmxPxwhCxHc0scgpN2bgj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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