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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32153f84f1b6289197d89cd61168a5140324d75e0538c13f556cc44cbfb26ae7' 
  AND token = 'oglKC/O4W0U8Et8tStGy52AH4xUSYxWkPOSp3GMjVHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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