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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd26403d5b8a4755a85b7fab80d742e1bf35e87b1f1e160c7c622ecdbdadc510' 
  AND token = 's5+lEPhisN+KXkZn94q4wclkjofhAqW/F1Z9ndPlKLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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