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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde871acb950f43d1262ee4f87f2b473b7e5d1e27e783127b361244c19de393b' 
  AND token = 'WzDuf7qksXVT05R6FJflXPvZ6efi9TJB+ezE3FCY51g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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