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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80fe807c1c032d90c0555e3c8e7ac672b535ab583dc85bd5b131704a2bb4d5c' 
  AND token = 'pCSz7CDQDDt2ADdNhq6R0scV9f8dbzsGniOVfmlZnLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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