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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a2f2448f6916e8d5dcbd82ec87c893a4c82f2fe26c8a275205b20c47b1615b' 
  AND token = 'T+aR4OTKC51+YW74RCkG8T6ndkhiuIs0jA8rH30StnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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