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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c2cdaad977f587462fe64d623a1c80c3e001d50045857d04bb7f64a937d7f2' 
  AND token = '65PaVAT/devJtokhacF/2wOLSc86ufUHg+v8voZFOCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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