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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97972036dd48a20c9259d2aa865f1cd8b9dfdeb1dae039d7b5bdcc1b92c43023' 
  AND token = 'LlUC4Qka0WnLpqweSWi3CnhTLk/yO/3gdzbXKsee/go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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