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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0754b0558997b669617df4a9161119f3fae523bd530c0c64389ed60f43a913e' 
  AND token = 'rhGfB0PmRJu3hFuD0sG9X6S07nNAcNg7N7nJJQan898=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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