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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904d083971bf170191939b5a10fd38dd8f40e880e707952bed04a5c56638c8e1' 
  AND token = 'aELPKt519oxJJW80LwtEDMpdlaJzBjMjMdXK+bWxAEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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