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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9ed5eefd7a609f07b973dff047100f4ff96ec99d534cad80bf9d1b60b71c8c' 
  AND token = 'ZIFRJLG1JX3g3BrDjwXDa5v5UNggDj3+hok1FcBURf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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