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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f383a1083755dcf4526bfe6d9706fb280f7c3059c908d020608e29baf2e930' 
  AND token = 'CVlBiXD3HjdQ1911sDX/BiPHUYxz62jjmM3Cb9mz7J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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