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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db2b7fed10bfc3f10a82aa66553aa9190d5d81ace870981ac364d0f9ede96b9' 
  AND token = 'mbmtS+bCDwST8cxT1U3CSWi7xB08ckbSOxHaz510YxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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