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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3de515a7110784399afaa83c2a24bc65b82d6f75c0edfe28eb24fecaa27bdb' 
  AND token = 'WdqGxpTeRBAeHr/KAqZ9ra7b+L223NQ3uk3PM42UB/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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