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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fb42c8e0a1b1a91f67357295eabfc346f1678756ef024d6061bd13deacf2e5' 
  AND token = 'KJ3T/FVfff14Yi4TEjhNtrbuwkuely0iLRkaY5w1sLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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