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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3cdcc1080dea68fc8284d367ae7c76f1c2af9050cefea9e039d7de3cc4cfb3' 
  AND token = 'FJzhveMpDS+I25wcKbZVhDoKQY2ta2SssyZUI0po5JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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