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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd7e69de2e435e068d86eaf153c13c6f72b83adc1e215e23345071b07eba3d1' 
  AND token = 'zikUjLK4zdHhEp1Ik5R93wscSgJm/tiGXr557QCMmwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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