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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcdeb7b7f1341643eac82ab0dd65ef3b098a66c2a8f463f561b8d6ec03eca30' 
  AND token = 'XzFmgS72iSyX/eTt0WaNlToHLYh9Upl1LV2PpN3JcE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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