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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98461f96f56505e4c3144614d6db0299f49112e9f54b678aa3b4b5f69f04421' 
  AND token = 'i3nYDdM2T1w4pSMoQdK6SSoFGZ3IIyLg4zYO1HgA0jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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