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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e42ab3c5d5e28e3ff0c4ae2c5fd5f73ca6f299c50c98fabeaf6291e2be46bf' 
  AND token = '/merFZyVkWQisC7Qi2dxEnya5QHqd19b9EeBoKXSfTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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