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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d896550d30d59dde3315b88575f09dc8645f50f91c935d2a5f64f59841b8e03' 
  AND token = '3SUxvSSxcuF/IaFg4UTv1SRxwRbTZrLGA9I+czhOETY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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