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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99054af5367009e6a75e2b4023cade0f149507b58cbc78871cf16feb9f0e971a' 
  AND token = '145U57KvHr/OG9g5gO2ImFfMtDlgCdj518azk6qsWHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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