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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e1f3aa61fe36d874d22cb93922947d1a79a18efcc2da3b9e1b4b06fe9505ca' 
  AND token = 'stDHSTIeVpma38QGsGf3YiFh3XqR5HiUG6yHbWU+40k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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