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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179de3b3982793ce3a8cc46486c8a246f37c31eb66bbd977c2b637c846b7726a' 
  AND token = 'eSnFIjlewyDeQ2/3xgSZ8G1yl8eB/tQe63PtHzHLDZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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