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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc294b0bdc7bc3082c4e7fd49904e41d2eb502b2404e2810866a6c47cc8bd255' 
  AND token = 'WH1/HlpSoh1b/Pf+n0CD9eHfSnapEq3hcShW+bkjX1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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