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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b699ccda25f5712927abddbef993362f14e2ab8171ac975b516426d3d525e7' 
  AND token = 'K7OLHNV6gBaQ5DIQod51OW+8Zll32/SdSVSKmrMVJdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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