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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96eacb0270c421f80b0fdab0a661a287c7c8b02fbf3db7be9fdc97064deace05' 
  AND token = 'kHtynw+vncn/fBvwl6wxab1BFYGnNJfxQb+8Ib/fH6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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