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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd5c395adada708167b171e5d38265152787daea3ffd9c0e980943e31622dc8' 
  AND token = 'N633JtXld/p1g4jkDhC3AOehM+iV/YvM0RFFtRuYYAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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